NON-CONTROLLING REDEEMABLE INTERESTS IN CONSOLIDATED FUNDS (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Non-Controlling Redeemable Interests in Consolidated Funds
Beginning balance	$ 344,047	$ 38,173,125
Cumulative-effect adjustment from adoption of accounting guidance	0	(37,969,042)
Initial consolidation of a fund	70,817	34,095
Contributions	210,964	116,896
Distributions	(39,397)	(51,694)
Net income	21,795	14,248
Change in distributions payable	1,128	481
Foreign currency translation and other	0	1,609
Ending balance	$ 609,354	$ 319,718